Cummins 6.7L ISB High Performance Valve Train Kit

Valve Train Kit Includes:(12) High Performance Intake Valves, 1.299" Head Diameter - 4.893" Length(12) High Performance Exhaust Valves, 1.299" Head Diameter - 4.907" Length(24) High Performance Valve Springs*(48) Valve Keepers
*Valve Spring Specs
Closed Pressure: 110@1.360 Coils / Turn Direction: 6.78 RH I.D: 0.743 Length: 2.035 O.D.: 1.058 Open Pressure: 159@1.060 Solid Height: 0.854 Wire Diameter: 0.157 x 0.126
SBIs diesel performance valves are a bimetallic design utilizing special processes which improve their overall durability and performance over stock valves. Each valve is constructed using a premium-grade austenitic stainless steel head material on both the intake (EV8) and exhaust (EV16) with a mid-stem weld using a high-grade chromium steel stem material (HNV3). Each valve is fully machined and nitrided all over, then polished. Each valve tip is hardened to a minimum of 50 HRc for added durability.
SBI Performance springs are manufactured from the highest quality-grade wire. The high qualitywire allows our springs to endure high loads produced by racing cams. Springs are heat-treatedand stress relieved to increase spring longevity and provide the stability needed for high loadsand high RPM. 
Benefit of Nitriding Process: Surface Hardness increases, hence fatigue life of spring increases by 32% Creep resistance of spring increases by 45% Valve Features Premium-grade austenitic stainless steel head material on both intake and exhaust. High-grade chromium steel stem material on both intake and exhaust. Special nitride processStrengthens entire valve and adds additional friction wear resistance. Polished stemBetter friction wear resistance and improved seal between valve stem and stem seal. Polished top of headOffers less carbon buildup. Mid-stem weldSuperior durability over wafer tip for these applications.  Nitride on seat face offers added wear resistance, hardness, and durability. Nitrided all over with a smooth black satin finish